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gmr1_rx: FCCH SNR computation improvement 

Signed-off-by: Sylvain Munaut <tnt@246tNt.com>
This commit is contained in:
Sylvain Munaut 2016-10-30 20:30:32 +01:00
parent 8d51afb939
commit 90526bca2e
1 changed files with 7 additions and 13 deletions
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20
src/gmr1_rx.c
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@ -678,22 +678,16 @@ fcch_multi_process(struct chan_desc *cd, fcch_multi_cb_t cb)
return rv;
}
/* Compute SNR (comparing energy with neighboring CICH) */
/* Compute SNR */
win_map(win, cd->bcch,
base_align + mtoa[i] + toa + 5 * cd->sps,
(117 - 10) * cd->sps
base_align + mtoa[i] + toa,
fcch_type->len * cd->sps
);
e_fcch = burst_energy(win);
win_map(win, cd->bcch,
base_align + mtoa[i] + toa + (5 + 117) * cd->sps,
(117 - 10) * cd->sps
);
e_cich = burst_energy(win);
snr = e_fcch / e_cich;
rv = gmr1_fcch_snr(fcch_type, win, cd->sps, -(cd->freq_err + freq_err), &snr);
if (rv) {
fprintf(stderr, "[!] Error during FCCH SNR estimation (%d)\n", rv);
}
/* Check against strongest */
if (i==0) {